Expansion bolt



Dec. 14, 1937. G. H. WATERMAN EXPANS ION BOLT Filed July 24, 1936 In menfor fi mieranarz- M Patented Dec. 14; 1937 V V V UNITED STATES PATENTOFFICE EXPANSION BOLT George Henry Waterman, Wyomissing, Pa. ApplicationJuly 24, 1936, Serial No. 92,339 1 Claim. (01. 85-221) This inventionrelates to that classification of nut 3| which may be smooth orotherwise extermechanicalelements and fasteners generally alnallyfinished. The nut 3| is provided with inluded to as wall attachingstuds, bolts, and. the ternal threads 32 and an outstanding annularlike, designed to accommodate hanger fixtures end flange 33 and isjoined to the shell 29 by a 5 and other structures intended to besecured to fragile annulus'34 providing a disruptable conthe wall.nection between the'said nut 3| and the adja- Needless to say, I amaware of the fact that it cent end portion of the shell 29. A nutadjustis common in this particular line of endeavor to n bolt 35 iSScrewed nt the ut 3 from the drill a brick or concrete wall and toanchor therefront end of the shell 29 and has mounted thereii) in aprojecting threaded stud 0r bolt, 1 am also on between the said frontend and the head of aware of the fact, however, thatthe socket drilledSaid b usual hanger, Wall fixture, in the wall to accommodate the studor other y screwing the b 35 ihwardly'the annulus 34 device cannotalways be formed with requisite is disrupted, the nut 3| drawn y, theaccuracy. Consequently, ,in brick and con r t shell 29 and the inner endof the latter expanded Walls in particular, the anchoring facilities arein the Wall socket, not shown, nd t e eby an- 15 not especiallyeflicient or dependable, chored therein. The advantage of having the Thepurpose of t r s t invention is t genshell 29 fluted is that thisfeature makes it poserally improve upon known prior n; and market sibleto bore a hole in the wall smaller in diameth d vic i thi classificationby providing an ter than the cross-sectional diameterof the shellarrangement which is characterized by appreci- Thus, by taking a hammerthe like it is 20 able refinements and structural distinctions, andPossible to drive the Shell 29 e, e ribs 30 other noteworthy advantagesand improvements. cutting through the Wall Of the Socket 3 n t Briefly dby way of'contrast with the recoglatter. This arrangement has itsadvantages not nized prior art structures, the present invention onlyfrom the po t o use, but from the ha t do t th adoption and use of asleeve standpoint of manufacturing, since it is possible 25 like ortubular fitting which is inserted into the to make the product of b s dsd awn throu h drilledsocketvin the wall and externally fluted a doublehex-shaped e. a or otherwise roughened to facilitate anchorage, Iii isthought that the description taken in 6 11- the-same beingassociatedwith an integral exnection with the drawing Will enable aclear 7 panding cone and a stud carried by the for understanding of theinvention to be had. 30 actuating it to obtain the desired security ofstud Therefore, a m le gthy description is thought anchorage. vunnecessary. V V

Figure 1 is a side elevational detail view of the While the preferredembodiment of the n major part'or unit of the structural assemblage tionhas been Shown and described it is to be showing a preferredconstructionand arrangeunderstood that minor changes coming Within 35ment of features the field of invention claimed may be resortedto Figure2 is a longitudinal sectional view taken 1f F 7 through the structureseen in Figure 1. 101mm:

Figure 3 is an'endview, that is an end eleva V In a structure of theclass described, a body 40 tional view, showing the fluted or ribbedsurface cylindrical in cross-Sectional tom} provided on its 40 f0 rperipheral surface with fins circumferentially g of the so calledanchormg i i or spacedand forming longitudinal retaining ribs e2211itraitsif:si;:5:this;thisit:

balsfideliemlent (if the 1n1e11t1n 1S a:bg d of said body, Said annularrib being breakable W 1 r P P S e (frmmg e 0 y of to permit longitudinalmovement of the nut into r fl grai gg fl ie gl l efi g i s i gzfggng dthe body to expand the latter, said nut being provided on its outer endwith an outstanding lateral provide longitudinal fins or ribs 30. At therear g end of the shell is an integral conical expanding GEORGE HENRYWATERMAN. 50

